THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The humeral head articulates with the glenoid fossa of the scapula. It is a shallow articulation, as the fossa accommodates less than one-third of the humeral head.

Detailed explanation-2: -The most proximal portion of the humerus is the head of the humerus, which forms a ball and socket joint with the glenoid cavity on the scapula.

Detailed explanation-3: -part of scapula …presents a shallow cavity, the glenoid cavity, which articulates with the head of the bone of the upper arm, the humerus, to form the shoulder joint.

Detailed explanation-4: -The end of the humerus or upper arm bone forms the ball of the shoulder joint. An irregular shallow cavity in the scapula called the glenoid cavity forms the socket for the head of the humerus to fit in. The two bones together form the glenohumeral joint, which is the main joint of the shoulder.